Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cb76fc16f290fa47d5b816023beee9f0668e88e90dda0c1d10350e1d274a83ea' 
  AND token = 'jG25VV9taXjAFmPelE7LAyKEcrT1p938YRMIN14cnC4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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