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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ad6c4668c95cf25cdf2f457c90a6dd8f7e04ec09bea3aeee6fafc46470713dfa' 
  AND token = 'qQFeuqJ/zDscBZJ2vyF7qyUTRbAnW0W80gGLmPtdD8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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