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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7ea6f567adbb6caf3bac19e3a805d0d1507102a7b9436cb9b849b18603d2ed50' 
  AND token = 'SxmtMFOGuGWKLqb+1bhkXFfTB7d/EdC2RKhyg0+qK9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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