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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bcea81064629964fbc61a59bd6acb4d68b4bb146d306443281c223f8b0af923e' 
  AND token = 'glLTFWqrwRr6ds2FO3lgEp4pu51m797xD7uN4GON9Wg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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