Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8f271e29fefc259ba875e17561f4a5deb0712431e7215495b0a8fd054cf39a0b' 
  AND token = '5O8SARP1kOVaxYJiIy/ctYOKptKgmTJGLCxkVhmk2Uk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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