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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a71c23ba4a764dd01d5028d0eddb3bc88c29a56c0d479943f1e16b926862a6ff' 
  AND token = '3FL2Y2UBXDlZ2exBtKbRFcRZ149QIZJpirmf1VB5bSk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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