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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'da7ebdb977eb67463c2bdad325de4fea3df946d4d9e3bede45ba219f0ddec5e5' 
  AND token = 'V7P0s/Rzb/FzaNYKCvd+HUvxz4zL/fJQHXm32NYdkDI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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