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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '38f153b6615592a5d0d3a65f3b4e532e11d55b667aa53a61cda328f183ddf574' 
  AND token = 'pxpcGt9DR3sF6TapxXmFBo2ltt7JF2JOjIf3XaV4+Fo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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