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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f8427cb3dffa36f6fc861ebc2193c670d144db35279e935a517e89697a6842ea' 
  AND token = 'pY8LoVkaTCcAy0MQfJP0auw37gJmqY4Mt90bB2345Zc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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