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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9b7550815fa06f2b023cfd0b8b83e5cada015731ba1d12a89261fec77b67842a' 
  AND token = 'BBog2mNGy5lgfkfEbLF24GiaaT82jw/dNc8ONZmJfeY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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