SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '03c1e23d878a885397501e06697f85888983ac65fe7b80d8e125f4d5fd2cb608' 
  AND token = 'mGO8jFT4Y7ueBvEh3KlcRvtX4UHpgoIbDuYkBqzHS6o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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