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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '459cf4c95fa1480c9b130827861adc76489396a18ccbc8556210684f68250aa4' 
  AND token = 'fvEoUIMkCUBkpavCLvt801L6c9W061iKMa3bgjc4iew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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