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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'acc124625bd0f093bf3277743153f5ad78cf1a939c46c12f250e26538dd662fc' 
  AND token = 'C32CAWpSbGVeuV/MVDBS4eA/dKImgLTwms3xGxrCi20=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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