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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '29c0619ebe2ce3181eb169cf5a02296ba5524128b7fb104b5df9ce52b4421061' 
  AND token = '6ljPwtrvtYaZkZtFNe/Lga9xuQHrKRXFv9b403E209M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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