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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6c1e185cdf80cbb3bb8a3bb2d518199beff950e6c2377cbf9e71b71d08a7be8e' 
  AND token = 'J8MUbnews/z7UlEPgsifdgOCIcUPNysF1Y2GacSNbHo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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