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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fcdc97856f4cb494dbf554b9b6386d0c3bc590d0bece08ed523518f8e90ee504' 
  AND token = 'ybWugkVb8srjNHXvRHN18qdE6QIg91PwwZe1fAZQzPg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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