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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3ff4a45515116f51ee540110a95fae1b17df869c23bd6e9abca16a0d3825b15a' 
  AND token = 'mE7xN+kdZrKJ58n3djac8q5lxAm+MGxWKhhi5CIOZz8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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