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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6f0e44adb46828d243760d10938a91d0987acb51dcd4f40b2ad08137baada2ec' 
  AND token = 'MJ3qc9WIJzXLwaxN6fsxTky8sjOZIFiQikLkaHS2a7E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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