SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c00f995f1928d71714f83fe1103d1bfba38fe3da13e347c54ff94fb2a22a8000' 
  AND token = '07IIvOtfTgOnUDJK6xKUqnQbwcYr3qAqx/Szp+S2LFw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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