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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '51dc6ea37c784dda18b206daaf2b66a2114930a934520b23a401aeab18fd76e2' 
  AND token = 'dlwE6zliFAVZMaIouaYMFkf4ThzTmi9R/3TqyDIxe6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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