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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '89753f5fe60e858584584d1c54cb0c937561ef24be942dc11b5eca78797428e8' 
  AND token = 'wP7Avl8rdlOAC6VubrvOYFtB2Zpkrdxr7ruwOAqcv3A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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