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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6024f397d2084b35d88486047fbfbecd16b4bbab471e2722f2bc8ad7b98d33e0' 
  AND token = 'js8dksK1brse1oASco0xfuGt9aUo70SUSdxsjVfnIos=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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