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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ae43e3a54d38e1086c8a376e0407ab0d566722d8a79ab6b9e947cda28a595fca' 
  AND token = '3QIkXLeLx1HrbNRJFJPFqLr+6Zs17S+eK6MYT1zl6TQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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