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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '479df4110e8ddd013457f065ad8b3d37432a58f0892c36307925192a3e5754b5' 
  AND token = 'J1kVcgle/dqAG8pEPDcFMZcQ4H7VcUsMrBp5pVudbok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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