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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c877c6f59ba3b5d9ab7df64d2575ff2e131b0a300b740f4dfc33fa1394108dbe' 
  AND token = '3TE4FwmSqRGa/VQsHsbah9dhe6R9S9Ozgx2eR5ddDuY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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