SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2df17b02dbe4a19ba4f544be81d25d3c8f294a129fdf7103cc4a74bd2d22053b' 
  AND token = 'hSczhVZzwApD1udqT1JyrXHR5/cKkZ2neJ9UD0N6B/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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