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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1304fa3de98279dee6de31ac272bca4842541601c7c0994cdc912575b9222992' 
  AND token = 'VahOpPb58+CcIfuhijQ6DaEs2OZA70NF+JWh19pI+tw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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