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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1fabbc03741be5e5d26af72ce4d040d364c015c212a8644f172f909bf2a56089' 
  AND token = '9FtWiX9yis3ZNAFgQhuRKgXPbbA5LQ7/aDPKiy7qZ40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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