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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c8c8103eb3a7b4b38c490a7c5dd3a3c76d54d5c1cc3fd265557379d799f08c36' 
  AND token = 'xQp6JspgFGHEvSnVtIX7AK59R0N/zEe9ILz5z624V64=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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