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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '08e15f877be962e23537b995093a9eb63ccd92a54462b16fe6b3504ee2fc3b2a' 
  AND token = 'H/WwRiot6ZmcoD+3PXGCSWaxt5gbm6BJ29OVzi8eSfI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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