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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '41c6aab4067fb531296e6378ec969374696b575ec538e08ba016ba30fd492cba' 
  AND token = 'eefzTZ6qE3SEdY4JHg6wDLT6R6tB0us4go9u334P97o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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