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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f3a4d6ae2c985aa43fadb73c76d9b78eb0506f81b7a42cd2bfad823e1d86f00d' 
  AND token = 'XxsaCI0KXoODkyjHnJecgga6EMNlsKwreNANqkpR7oc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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