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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '61b290c0c5aa6af061152c1a3a253d7b2a8a0f4afc40c1eb9d69188f6082eb08' 
  AND token = 'md7Ua7rU6XwkDhi8GW4h2QkpNrO1UhaaADrdlqekEbU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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