SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '211b992a9edf7661373b8d9282a17f24610551dbba9b77ef08ad4c6b46b3165c' 
  AND token = '8HDBglQIMYDeVWKSqsHp9+Pyo/5txl+WhPhmIDBxmFQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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