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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a948b3f333d72cc91b7652b0eac28e0725fa8713b7e98b5fd812b2d6d7828eac' 
  AND token = 'U2vTXCwIzGmLbDSjKLWW6DnUnJ/yW38UjnjrTykKJ9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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