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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fa984b25add2deaf129eeb9e209e3d9dbbc735102e3a9e846d2f6a7634d33921' 
  AND token = 'tkUP9ExqFOv3VUO+pNHXT/kJHDyWgyFbInMOlOoT2QA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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