SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6ee4885c608c85909171d5422b604acf04498184dd15268c62c3417849a65bfb' 
  AND token = 'JV4Hsm2T3WvRWZRiRrOlG4qhC3joayDTRCY2rTQsXqM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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