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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '978f78792a0ddcfc801850bb88f59b507d97fb7206fd0749e5f69af4c1c7913a' 
  AND token = 'jTUMs8xljNlbjCtBKzlSoTi/Z7NTi+/Qlgr+Nd+JiXI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}