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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '11d0de0075f31ef59a74481749a9505d6c18e68b25525ba64d05d4be3abb8ebb' 
  AND token = 'pkaLbDtcKF4BYrAWoNqR8t6XYHnx4bHmVgUFXY36mh8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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