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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1356b57d9e3cd45a8c162889921f35b767242e38629f83b716bf70f5a8d515cd' 
  AND token = '0qXts1Z/LedRcKtPc6t+hAzqf5xeY9DrGHdTrtbq/EY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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