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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1e992d51b55220b783d981aef2bd68df1abb4de17db930291296592b50126c03' 
  AND token = 'n/8/v2uvZpIscdTExwkUXofvG4vB9gV35LE4kpN/wKk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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