Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2e8ba75c4bfc95f029df4f7a4c781df698da5adcadc9ecf06a9abb9f18c2b85f' 
  AND token = 'RQ1r4ajq4sSPS/SBs0DnGgAF5Timy1nobQn1OwJhdZo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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