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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '71a824278c32ca4fb08f7f2ac1e49e23eca0effe889b97e2b4833960055a5a73' 
  AND token = 'DUe0rCV6H23j2ONye0t5tApWvaQks0nd+Fot+KNrT5A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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