SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6d24d5783c9bd47f296f74ccb03f63bdd70c137fc2b3047bea531bc55b6f1ed5' 
  AND token = 'qdUVwa9/bWhFu7wJ8ZBjNahs34V9IebvW3ySyfhTTJM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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