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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2e80b4bbaf64f9a3908cdd83204cde388434d84b0224b91e6c9bef61c2a173a5' 
  AND token = 'Ft6Zy6ECuWVPlAj1H4A4cb8EL9wjK1HPW3lBH98qe08=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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