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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '82deadf4fbb88668a7e8da3c17e0a3511c1b6fd4ff537a30e6e244700442f9c4' 
  AND token = '4bEUmDov4/6XqlRT/dwt0YGH9qhsswAbuftaM0nqusE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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