SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'caf36a520644a2a61740372c0c8bb1a500cd6ed0fd78b9a7be883ded92aa083c' 
  AND token = 'MSdy2htgun4GA80dEjqojwsyJYZJBjOu1HYdVhwRBfI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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