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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f46262e7cee3100d77ab473d6d671c3c23ebf729fe1295d3f72eb51496eb3996' 
  AND token = 'q+9I5rSKfHHvT4HRCsq0eaQcbFETnJqb/zws1/22eP8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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