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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '601525eef0ee0ae75a26d27ea315315b3a0c046b838f324bc02d5486560a845a' 
  AND token = '+/m89Y5Qq4Q9Hl+Hh+1JM6JxxLoYllOe51nuUSrZm6E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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