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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7788023cd8da44686b95af24d6469d83c456f1ef328ea8d6c7a56a9dc9600464' 
  AND token = 'BZ7tysr17jUcqF/Mw8pLQWq7YnanAqkkVxMGyyYvdAo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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